The surface photovoltage(SPV)mechanism of a silicon nanoporous pillar array(Si-NPA)is investigated by using SPV spectroscopy in different external electric fields.Through comparisons with the SPV spectrum of single cr...The surface photovoltage(SPV)mechanism of a silicon nanoporous pillar array(Si-NPA)is investigated by using SPV spectroscopy in different external electric fields.Through comparisons with the SPV spectrum of single crystal silicon(sc-Si),the silicon nano-crystallite(nc-Si)/SiO_(x) nanostructure of Si-NPA is proved to be capable of producing obvious SPV in the wavelength range 300–580 nm.The SPV for the sc-Si layer and the nc-Si/SiO_(x) nanostructure has shown certain contrary characters in different external electric fields.Through analysis,the localized states in the amorphous SiO_(x) matrix are believed to dominate the SPV for the nc-Si/SiO_(x) nanostructure.展开更多
A series of silicon nanoporous pillar array(Si-NPA)samples are prepared with different times of hydrothermal etching,and their surface morphologies are characterized.A systematic study on the evolution trend of the su...A series of silicon nanoporous pillar array(Si-NPA)samples are prepared with different times of hydrothermal etching,and their surface morphologies are characterized.A systematic study on the evolution trend of the surface photovoltage and photoluminescence spectra discloses that the adoption of a prolonged etching time will increase the native degree of oxidation and decrease the interfacial states density localized in the SiO𝑥matrix.These results might be helpful for designing Si-NPA-based semiconductor nanosystems with optimized physical properties.展开更多
Nanoscale hybrid organic/inorganic Langmuir-Blodgett films of cerium-substituted heteropolymolybdates(Ce-HPMo) and π-conjugated macromolecule poly(1,2-dihydro-2,2,4-trimethyl)quinoline(PQ) were obtained with auxiliar...Nanoscale hybrid organic/inorganic Langmuir-Blodgett films of cerium-substituted heteropolymolybdates(Ce-HPMo) and π-conjugated macromolecule poly(1,2-dihydro-2,2,4-trimethyl)quinoline(PQ) were obtained with auxiliary film-forming material stearic acid(SA) or octadecylamine(ODA). The surface pressure-area isotherms illuminate the formation of the hybrid LB films of PQ/ODA/Ce-HPMo and PQ/SA/Ce-HPMo. The different film-forming mechanism was discussed when the different auxiliary film-forming materials were used in the system. The absorption spectra indicate that the molecules of PQ and Ce-HPMo are incorporated into the LB films. Tapping-mode AFM image reveals a granular surface texture of nanosized Ce-substituted heteropolymolybdate. STM image shows that the conductivity is greatly improved after Ce-substituted heteropolymolybdates are incorporated in the films.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11074224.
文摘The surface photovoltage(SPV)mechanism of a silicon nanoporous pillar array(Si-NPA)is investigated by using SPV spectroscopy in different external electric fields.Through comparisons with the SPV spectrum of single crystal silicon(sc-Si),the silicon nano-crystallite(nc-Si)/SiO_(x) nanostructure of Si-NPA is proved to be capable of producing obvious SPV in the wavelength range 300–580 nm.The SPV for the sc-Si layer and the nc-Si/SiO_(x) nanostructure has shown certain contrary characters in different external electric fields.Through analysis,the localized states in the amorphous SiO_(x) matrix are believed to dominate the SPV for the nc-Si/SiO_(x) nanostructure.
基金Supported by the National Natural Science Foundation of China under Grant No 11074224.
文摘A series of silicon nanoporous pillar array(Si-NPA)samples are prepared with different times of hydrothermal etching,and their surface morphologies are characterized.A systematic study on the evolution trend of the surface photovoltage and photoluminescence spectra discloses that the adoption of a prolonged etching time will increase the native degree of oxidation and decrease the interfacial states density localized in the SiO𝑥matrix.These results might be helpful for designing Si-NPA-based semiconductor nanosystems with optimized physical properties.
文摘Nanoscale hybrid organic/inorganic Langmuir-Blodgett films of cerium-substituted heteropolymolybdates(Ce-HPMo) and π-conjugated macromolecule poly(1,2-dihydro-2,2,4-trimethyl)quinoline(PQ) were obtained with auxiliary film-forming material stearic acid(SA) or octadecylamine(ODA). The surface pressure-area isotherms illuminate the formation of the hybrid LB films of PQ/ODA/Ce-HPMo and PQ/SA/Ce-HPMo. The different film-forming mechanism was discussed when the different auxiliary film-forming materials were used in the system. The absorption spectra indicate that the molecules of PQ and Ce-HPMo are incorporated into the LB films. Tapping-mode AFM image reveals a granular surface texture of nanosized Ce-substituted heteropolymolybdate. STM image shows that the conductivity is greatly improved after Ce-substituted heteropolymolybdates are incorporated in the films.
